I’ve been using shared tabs to manage a load of bills with my housemate and it’s generally great. Managing bills is way easier.
When I came to think about settling up, however, I clicked the “Settle Up” button expecting to see some sort of confirmation screen or options on how much or who to pay. Instead, it scanned my face with Face ID and, before I knew it, sent the full amount. That was a bit too easy.
I’d suggest adding a confirmation screen to the flow, or at least making it require a PIN so an accidental press of the button doesn’t result in sending money.